Waterproof magnesium oxychloride cement with adjustable setting time and preparation method thereof
A technology of magnesium oxychloride cement and setting time, which is applied in the field of water-resistant magnesium oxychloride cement materials, can solve the problems of poor water resistance of magnesium oxychloride cement, and achieve the effect of solving poor water resistance
Active Publication Date: 2017-08-25
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0007] The technical problem mainly solved by the present invention is to provide a modification method of magnesium oxychloride cement, which can realize the control of setting time by adjusting the mass fraction of calcium oxide and phosphoric acid, and can solve the problem of poor water resistance of magnesium oxychloride cement at the same time
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[0036] The method for preparing magnesium oxychloride cement of the present invention includes the following steps:
[0037] (1) Measure 29.78ml of 2%-9% phosphoric acid solution;
[0038] (2) Weigh 33.63g of magnesium chloride hexahydrate, place it in the phosphoric acid solution of step (1), and stir until it dissolves;
[0039] (3) Weigh 37.6-40g of magnesium oxide, add it to the solution of step (2) in 6-8 batches, stir for 15-20min, and form a gel;
[0040] (4) Weigh 0.8~2.4g calcium oxide, add it to the colloid of step (3) in 3~5 batches, and stir for 5~10min;
[0041] (5) After being placed in a mold for molding, it is demolded and cured at ambient temperature.
[0042] ① Setting time: Pour the prepared magnesium oxychloride cement slurry into a metal mold with a size of 10mm×10mm×10mm and place it in the air for curing. Use Gilmore double needles to measure the setting time, use a lighter needle with a larger cross-sectional area (m = 113.4g, d = 2.13mm) to determine the initial...
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The invention discloses waterproof magnesium oxychloride cement with adjustable setting time and a preparation method thereof. The preparation method comprises the following steps: (1) mixing phosphoric acid and water according to a mass ratio to obtain a phosphoric acid solution; (2) weighing magnesium chloride hexahydrate and adding the magnesium chloride hexahydrate into the phosphoric acid solution; stirring and dissolving to obtain a solution; (3) weighing magnesium oxide and equally dividing the magnesium oxide into 6 to 8 parts; then adding the magnesium oxide into the solution of step (2) in sequence and stirring for 15min to 20min to dissolve, so as to obtain colloid; (4) weighing calcium oxide and equally dividing the calcium oxide into 3 to 5 parts; then adding the calcium oxide into the colloid in sequence and stirring for 5min to 10min; (5) putting a product obtained by step (4) into a mold and molding; then de-molding and curing at environment temperature. By changing the ratios of the calcium oxide and the phosphoric acid, the setting time of the magnesium oxychloride cement is continuously adjustable, and initial setting time and final setting time are accurate and controllable; meanwhile, the waterproof property of the magnesium oxychloride cement can be greatly improved through the matched modification effect of the calcium oxide and the phosphoric acid, so that the magnesium oxychloride cement is beneficial to actual utilization in fields including building materials and the like.
Description
Technical field [0001] The invention relates to the technical field of the preparation of magnesium oxychloride cement, in particular to a water-resistant magnesium oxychloride cement material with adjustable setting time. Background technique [0002] Magnesium oxychloride cement was invented by the Swedish scholar Sorrell in 1867, so it is also called Sorrell cement. It is a kind of air-hardening glue made from light-burned magnesium oxide, magnesium chloride and water in a certain proportion. Coagulation material. The material has a series of excellent properties, such as good mechanical strength, weak alkalinity, low corrosion, good wear resistance, excellent adhesion, good flame retardancy and heat insulation, etc., these excellent The properties of magnesium oxychloride cement products are widely used, involving construction materials, transportation, agriculture, light industry, machinery and other fields. However, the setting time of magnesium oxychloride cement is limi...
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Login to View More IPC IPC(8): C04B9/06C04B9/20
CPCC04B9/06C04B9/20
Inventor 李峻峰谭雪余圣圣刘佳明赵瑞兰刘雨晴高阳赖雪飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY